There's another reason why you should love your enemies, and that is because hate distorts the personality of the hater. We usually think of what hate does for the individual hated or the individuals hated or the groups hated. But it is even more tragic, it is even more ruinous and injurious to the individual who hates.... For the person who hates, the true becomes false and the false becomes true. That's what hate does.

The Papers of Martin Luther King, Jr: Symbol of the movement, January 1957-December 1958 (ed. Univ of California Press, 2000) - ISBN: 9780520222311